The heads Up Display in my MY16 L405 TD6 will run for about an hour and then seems to overheat and shut down. This is a recent problem in the past 2 weeks. I bought a unit off eBay for a 2017 and plan on replacing the '16 unit with that. Prior to any of this - I am going to source and replace the fans on the 2017 unit. Tore into it tonight and have some pics to share.
This is obviously a composite - let me know if you need more

Click image to enlarge

Click image to enlarge

Your secondary projector as you call it, may actually be a DMD from a DLP projector setup …

In other words … your primary projector is just a light source sending light out, and rather than passing it through an LCD screen to control pixel brightness, it’s bouncing that light off an array of very small mirrors ( your secondary projector bit ). The mirrors are controlled at a pixel resolution to bounce the light either onwards to output end of the display to light up a pixel, or somewhere else to no light up a pixel. ( possibly that somewhere else is behind the mirror array which is why it needs a heat sink to dissipate the light energy its not sending onwards ). V8 or else ...

The HUD is manufactured by Panasonic, as are the Touch Pro Duo screens:  2019 Vogue P400e

fisha wrote:

Your secondary projector as you call it, may actually be a DMD from a DLP projector setup …

In other words … your primary projector is just a light source sending light out, and rather than passing it through an LCD screen to control pixel brightness, it’s bouncing that light off an array of very small mirrors ( your secondary projector bit ). The mirrors are controlled at a pixel resolution to bounce the light either onwards to output end of the display to light up a pixel, or somewhere else to no light up a pixel. ( possibly that somewhere else is behind the mirror array which is why it needs a heat sink to dissipate the light energy its not sending onwards ).